Let me start by saying, this little device is a hidden gem for anyone looking to improve their breathing technique and core strength. I've been using it daily for a few weeks now, and I can already feel the difference in my lung capacity during workouts.

The best part? It's incredibly lightweight and portable. I toss it in my gym bag or even my purse - no excuses not to use it throughout the day. The three resistance levels are perfect for gradually building up strength, though I do wish the instructions were clearer (had to watch some YouTube tutorials to get started).

What surprised me most was how effective it is for abdominal training. You can really feel your core engaging with each breath - way more intense than I expected from such a simple device! Cleaning is a breeze too, which is great because hygiene with breathing devices is crucial.

The only real downside is the lack of detailed English instructions as mentioned in other reviews. But once you get the hang of it (took me about two days), using it becomes second nature. For the price, this delivers way more value than I anticipated - definitely recommend giving it a try if you're into fitness or just want to improve your breathing!